46>45.
Not even close for me. I like the return to the slightly more "mechanical" look (however you choose to interpret that) and the head sculpt plus accessories put it over the edge. It also helps that it's an armor from one of the best Marvel films. IMO it's only behind TWS and in the same tier as Avengers and GOTG. The Mk46 also had a ton of action whereas the Mk45's impact is mostly forgettable in AoU aside from the initial confrontation with Ultron where everyone said their "oooh's and ahhh's" when he landed in the church.
Already have the DC Mk6 and 5 on PO, will go for the rest of the HoA Mks if/when they do them. Definitely not getting the Mk47. Keeping an open mind to the IW and Avengers 4 armors.